PR #4969 fix: warn about unknown toolchain file keys

fix: warn about unknown toolchain file keys #4969

ychampion wants to merge 2 commits into rust-lang:main from ychampion:warn/toolchain-file-unknown-keys

Surface toolchain file mistakes before strict parsing

58d85561

rami3l commented on 2026-07-27

Keep unknown-key reporting in the parser path

e480ed8e

rami3l requested changes on 2026-08-03

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